Update module openzipkin/zipkin-go to v0.2.5

go.mod

@@ -15,7 +15,7 @@ require (
 	github.com/gorilla/handlers v1.5.1
 	github.com/lunixbochs/struc v0.0.0-20200707160740-784aaebc1d40
 	github.com/miscreant/miscreant.go v0.0.0-20200214223636-26d376326b75
-	github.com/openzipkin/zipkin-go v0.2.2
+	github.com/openzipkin/zipkin-go v0.2.5
 	github.com/prometheus/client_golang v1.9.0
 	github.com/russross/blackfriday/v2 v2.0.1
 	github.com/shurcooL/sanitized_anchor_name v1.0.0 // indirect